Venturi tube



Sept. 18, 1934. c. JUSTHEIM VENTURI TUBE Filed Jan. 11, 1934 V/z WPatented Sept. 16, 1934 UNITED- STATES PATENT OFFICE VENTURI TUBEClarence I. Justheim, Salt Lake City, Utah Application January 11, 1934,Serial No. 706,308 R E I S S U 4 Claims. '(01. 230-92) My inventionrelates to Venturi or suction tubes and has for its object to provide anew and efficient suction tube which may be 'used to create planes forsuction in any desired place, such as upon aeroactuating their windinstruments, on automobiles to gauge wind resistances when traveling, orto actuate the speedometer of the automobile, or to be used in thesuction device for mixing fuel and air for carburetion of the fuel forthe .engine.

A further object is to provide a suction device which has the interiorform so designed thatit will accomplish the best results obtainable witha suction tube either when used with gas or fluids.

A still further object is to provide a suction Venturi tube for drawingfluids therethrough to increase the suction in the ports thereof, thedesign being such as to create the greatest suction obtainable with thistype of device.

These objects I accomplish with the device illustrated in theaccompanying drawing in which similar numerals and letters of referenceindicate like parts throughout the several views and as described in thespecification forming a part of 5 this application and pointed out inthe appended claims.

In the drawing in which I have shown the device 1 Figure 1 is adiagrammatic view to illustrate the proper manner of laying out thedesign for the tube with the correct and most eflicient angles of flareused therein.

Figure 2 is a diametrical section of the device showing the use of onlyone suction port.

Figure 3 is a diametrical section of the device showing the use of aring of ports through the de- J vice into an annular ring, to createsuction in the ring, and thereby from' the device to which the lead linefrom the ring is attached.

This application is a segregation of portions of the patent applicationfiled by me on February 2, 1932, serial Number 590,493, for Suction andvaporizing devices.

In the drawing I have shown the device as made of opposed frusto-conicalchambers A and B joined together by a curved wall C with the angles offlare and the diameters and radii figured out to give the most efiicientdevice possible.

In Figure 1, the diagrammatic view, the manner of building the. deviceis shown. The flare A is made by first laying out the walls thereof witha predetermined flare. This tube is preferably eight inches long with aninternal diameter at the small end of 1 inch. At the small end of theflared tube A, I then lay off a line a perpendicularto the wall 3 andthen using a radius equal to the diameter of the small end, I thenscribe the curved wall C. With the line a as a base, I

I then erect a perpendicular line b thereto, the base gential to thecurve, and the small end of the chamber B is of larger diameter than thesmall end of the chamber A.

In Figure 2 of the drawing a port 1 leads into the interior of thedevice at that juncture of the curved wall C to the chamber A at thepoint at which the inner 'wall 3 of the chamber A is tangential to theinner wall 4 of the curve C. The port is formed or. bored through thewall with the axis thereof in alignment with the juncture of the curvedwall to the flared wall 3 but slight variation may be made withoutdeparting from the efiiciency of the-device to any great degree.

In Figure 3 of the device the juncture of the curved wall to the chamberA is surrounded by so an annular chamber. 5 formed of two halves securedtogether to form the completed chamber and the interior of the chamber 5is in connection with the interior of the device by the row of ports 6bored through the-wall 7 of the flared chamber A1 at the tangentialjuncture-of the curved wall 8 to the wall 7. A lead' line 9 draws fromany suitable or desired source or creates suction in any instrument towhich the device may be attached.

An arrow :1: shows the fluids through the device.

In using this Venturi tube as a carburetor suitable control valves mustbe provided to con- 95 trol the suction through the device, and thesevalves maybe mounted at either end of the suction device or at both endsif so desired.

Through experimentation, the following table was worked out for theflared chamber B to show the various results using different flares,thus showing, that the best angle of flare is that described.

direction of travel of The contraction coefllcients were then deducedfrom Cc=C+Cm The method of obtaining the coefiicient of velocity makesno allowance for the retardation of the particles in the chamber B bythe atmosphere; hence the coefficients may be a little small, and thecontraction coefficients would then be too large, as deduced from theabove equation.

This would seem to account for the value 1.001, as seen in the secondcolumn.

Relative to the chamber A, the chief loss or head in the standard shorttube is occasioned by the sudden enlargement of the contracted vein tofill the full section of the tube. Thus the curve of chamber A is formedwith the walls to fit the curve of the passing fluid in order to obtainthe greatest eficiency,

Having thus described my invention, I desire to secure by Letters Patentand claim:

1. In a Venturi tube, the combination or": onposed :trusto-conicalaxially aligned chambers joined together by a curved wall with the chamher into which the fluid is introduced of larger diameter than the othercber, and with the smaller chamber tangential to the curved wall.

2. In a Venturi tube, the combination of a flared chamber having thesmall end joined onto an inwardly curved wall; another flared chamberjoined onto the end of the curved wall with thewalls thereof tangentialto the curve; and a port through the tangential juncture of the curvedwall to the'flared chamber.

3. In a device of the class described, the combination of arustic-conical chamber joined to an opposed irusto-conical chamber by acurved wall with the smaller diametered chamber joined to the curvedwall so that the walls are tangential to the curve; a row of annularports through rec

